src/org/mockito/internal/util/junit/JUnitFailureHacker.java

/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal.util.junit;

import org.junit.runner.notification.Failure;
import org.mockito.internal.exceptions.ExceptionIncludingMockitoWarnings;
import org.mockito.internal.util.reflection.Whitebox;

public class JUnitFailureHacker {

    public void appendWarnings(Failure failure, String warnings) {
        if (isEmpty(warnings)) {
            return;
        }
        //TODO: this has to protect the use in case jUnit changes and this internal state logic fails
        Throwable throwable = (Throwable) Whitebox.getInternalState(failure, "fThrownException");

        String newMessage = "contains both: actual test failure *and* Mockito warnings.\n" +
                warnings + "\n *** The actual failure is because of: ***\n";

        ExceptionIncludingMockitoWarnings e = new ExceptionIncludingMockitoWarnings(newMessage, throwable);
        e.setStackTrace(throwable.getStackTrace());
        Whitebox.setInternalState(failure, "fThrownException", e);
    }

    private boolean isEmpty(String warnings) {
        return warnings == null || "".equals(warnings); // isEmpty() is in JDK 6+ 
    }   
}